77KZ650 Brake Upgrade

Hi all, it's been a long time since I've been on this site! I've been doing the ZRX1200 thing for the past 4 years, but my beloved KZ650 needs a little attention so I'm back!

My brake calipers are leaking and need a rebuild. My bike is pretty hot rodded (810cc kit, Big WebCAMS, Shocks, Custom Gold Valve emulators, etc.) so I think it's time for some big brakes.

I'm running the stock 19" and 18" spoked wheel combo with dual discs from an SR today.

I'd like to fit up a modern brake system from another bike. The wheels have the 4 bolt pattern for the brake discs.

Does anyone know of a modern set of 310mm or 320mm Discs that can simply be bolted to my Kawi 4 bolt hub? I can handle getting caliper brackets fabbed up, and if I need to I can probably get a spacer plate made up to space the discs out from the wheel and gain clearance for the caliper and spokes. I'm really looking right now for an easy bolt up set of modern discs!